From: Peter Zijlstra <peterz@infradead.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Dave Jones <davej@redhat.com>,
tim.c.chen@linux.intel.com, linux-kernel@vger.kernel.org,
Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: Change in default vm_dirty_ratio
Date: Wed, 20 Jun 2007 10:35:36 +0200 [thread overview]
Message-ID: <1182328536.21117.24.camel@twins> (raw)
In-Reply-To: <20070619214407.dfff0ca6.akpm@linux-foundation.org>
On Tue, 2007-06-19 at 21:44 -0700, Andrew Morton wrote:
> Anyway, this is all arse-about. What is the design? What algorithms
> do we need to implement to do this successfully? Answer me that, then
> we can decide upon these implementation details.
Building on the per BDI patches, how about integrating feedback from the
full-ness of device queues. That is, when we are happily doing IO and we
cannot possibly saturate the active devices (as measured by their queue
never reaching 75%?) then we can safely increase the total dirty limit.
OTOH, when even with the per BDI dirty limit the device queue is
constantly saturated (contended) we ought to lower the total dirty
limit.
Lots of detail here to work out, but does this sound workable?
next prev parent reply other threads:[~2007-06-20 8:35 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-06-18 21:14 Change in default vm_dirty_ratio Tim Chen
2007-06-18 23:47 ` Andrew Morton
2007-06-19 0:06 ` Linus Torvalds
2007-06-19 0:09 ` Arjan van de Ven
2007-06-19 18:41 ` John Stoffel
2007-06-19 19:04 ` Linus Torvalds
2007-06-19 19:06 ` Linus Torvalds
2007-06-19 22:33 ` David Miller
2007-06-19 19:57 ` Andi Kleen
2007-06-20 4:24 ` Dave Jones
2007-06-20 4:44 ` Andrew Morton
2007-06-20 8:35 ` Peter Zijlstra [this message]
2007-06-20 8:58 ` Andrew Morton
2007-06-20 9:14 ` Jens Axboe
2007-06-20 9:19 ` Peter Zijlstra
2007-06-20 9:20 ` Jens Axboe
2007-06-20 9:43 ` Peter Zijlstra
2007-06-21 22:53 ` Matt Mackall
2007-06-21 23:08 ` Linus Torvalds
2007-06-23 18:23 ` Peter Zijlstra
2007-06-24 16:40 ` Linus Torvalds
2007-06-25 0:15 ` Peter Zijlstra
2007-06-20 9:19 ` Peter Zijlstra
2007-06-21 16:54 ` Mark Lord
2007-06-21 16:55 ` Peter Zijlstra
2007-06-20 17:17 ` Linus Torvalds
2007-06-20 18:12 ` Arjan van de Ven
2007-06-20 18:28 ` Linus Torvalds
2007-06-21 12:37 ` Nadia Derbey
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